SOLUTION: Find all values of 't' in the interval [0, 2pi] that satisfy 2cos't'+1=0

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Question 1039442: Find all values of 't' in the interval [0, 2pi] that satisfy 2cos't'+1=0
Found 2 solutions by Boreal, ikleyn:
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
that is 2 cos t= -1
cos t= (-1/2)
That occurs in the 2nd and third quadrants.
That is at pi/3 and 2 pi/3
graph%28300%2C200%2C-1%2C5%2C-1%2C1%2Ccos%28x%29%29

Answer by ikleyn(52786) About Me  (Show Source):